Preheat the oven to 350°F. Line a large baking sheet with parchment paper. Set aside.
Add the ground flax seeds and water in a small bowl. Set aside and let thicken.
In a medium bowl, cream the vegan butter, granulated sugar and brown sugar together. Add the vanilla and flax egg and mix until combined.
In another medium bowl, add the flour, chai spice tea, baking soda and salt. Stir to combine.
Transfer the dry mixture to the wet mixture and stir until just combined. Avoid overmixing.
Form 12 cookie dough balls and place them on the prepared baking sheet, keeping some distance. You might need to work in two batches. Bake for 11 minutes at 350°F. Let them cool completely on the baking sheet.
Meanwhile, prepare the glaze: In a medium bowl, whisk together all the ingredients.
Once cooled completely, top the cookies with the glaze and a small sprinkle of ground cinnamon. Enjoy!